[clang] [clang][Darwin] Remove legacy framework search path logic in the frontend (PR #120149)

[Ian Anderson via cfe-commits]

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@@ -8265,6 +8265,11 @@ def internal_externc_isystem : Separate<["-"], "internal-externc-isystem">,
            "implicit extern \"C\" semantics; these are assumed to not be "
            "user-provided and are used to model system and standard headers' "
            "paths.">;
+def internal_iframework : Separate<["-"], "internal-iframework">,
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ian-twilightcoder wrote:

Should we call this `internal-externc-iframework` since it more closely corresponds to `internal-externc-isystem` than `internal-isystem`? Especially its position in the search ordering system -> internal-system -> internal-externc-system 

https://github.com/llvm/llvm-project/pull/120149